package com.zyan.miaosha.redis;

import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
 * @author zyan
 * @version 1.0
 * @date 19-11-21 下午7:43
 */
@Service
public class RedisService {

    @Autowired
    JedisPool jedisPool;


    /**
     * 获取单个对象
     * @param keyPrefix
     * @param key
     * @param clazz
     * @param <T>
     * @return
     */
    public <T> T get(KeyPrefix keyPrefix, String key, Class<T> clazz){
        Jedis jedis = null;

        try {
            jedis = jedisPool.getResource();

            //生成真正的key
            String realKey = keyPrefix.getPrefix() + key;
            String str = jedis.get(realKey);
            T t = stringToBean(str, clazz);
            return t;
        }finally {
            returnToPool(jedis);
        }

    }

    public <T> boolean set(KeyPrefix keyPrefix, String key, T value){
        Jedis jedis = null;

        try {
            jedis = jedisPool.getResource();
            String str = beanToString(value);
            if (str == null || str.length() <= 0){
                return false;
            }
            String realKey = keyPrefix.getPrefix() + key;
            int seconds = keyPrefix.expireSeconds();
            if (seconds <= 0){
                jedis.set(realKey, str);
            }else {
                jedis.setex(realKey, seconds, str);
            }
            return true;
        }finally {
            returnToPool(jedis);
        }

    }


    /**
     * 判断key是否存在
     * */
    public <T> boolean exists(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.exists(realKey);
        }finally {
            returnToPool(jedis);
        }
    }


    /**
     * 删除
     * */
    public boolean delete(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            long ret = jedis.del(realKey);
            return ret > 0;
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 增加值
     * */
    public <T> Long incr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.incr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    /**
     * 减少值
     * */
    public <T> Long decr(KeyPrefix prefix, String key) {
        Jedis jedis = null;
        try {
            jedis =  jedisPool.getResource();
            //生成真正的key
            String realKey  = prefix.getPrefix() + key;
            return  jedis.decr(realKey);
        }finally {
            returnToPool(jedis);
        }
    }

    public static  <T> String beanToString(T value) {
        if (value == null){
            return null;
        }
        Class<?> clazz = value.getClass();
        if (clazz == int.class || clazz == Integer.class){
            return ""+value;
        }else if (clazz == String.class){
            return (String) value;
        }else if (clazz == long.class || clazz == Long.class){
            return ""+value;
        }else {
            return JSON.toJSONString(value);
        }
    }

    public static  <T> T stringToBean(String str, Class<T> clazz) {
        if (str == null || str.length() <= 0 || clazz == null){
            return null;
        }
        if (clazz == int.class || clazz == Integer.class){
            return (T)Integer.valueOf(str);
        }else if (clazz == String.class){
            return (T) str;
        }else if (clazz == long.class || clazz == Long.class){
            return (T)Long.valueOf(str);
        }else {
            return JSON.toJavaObject(JSON.parseObject(str), clazz);
        }
    }

    private void returnToPool(Jedis jedis) {
        if (jedis != null){
            jedis.close();
        }
    }


}
